JP2002332797A - Back-filling material filling device and lining construction method in pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a back-filling material filling device capable of smoothly discharging a back-filling material, and an existing pipe lining construction method using the back-filling material filling device. SOLUTION: This back-filling material filling device has an outer pipe part, an inner pipe part disposed inside, and an injection nozzle 15 at the tip, and is fitted with an air supply means for supplying air to the outer pipe part and inner pipe part. The back-filling material can be smoothly discharged and filled by a lowering of apparent viscosity of the back-filling material by mixing air, with the help of air pressure. When the existing pipe is lined by a pipe manufacturing machine mounted with final back-filling material filling devices 1 and 1', the installation of a new tubular body in the existing pipe, and filling of the back-filling agent between the existing pipe and the new tubular body are smoothly performed at the same time to provide the simple existing pipe lining construction method of a short construction period.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backfill material injection device used for injecting a backfill material between an existing pipe and a separate pipe when the pipe is arranged between the two pipes. The present invention relates to a method for lining a pipe.

[0002]

2. Description of the Related Art Agricultural water pipes, sewer pipes, water pipes and the like are durable, but they are buried underground and used for an extremely long period of time. In order to rehabilitate old pipes due to cracks or corrosion, the existing pipes may be lined. As one method of lining an existing pipe, a method of arranging a separate new pipe in the existing pipe is known.

That is, in the prior art in-pipe lining method, a device called a pipe-making machine is carried into an existing pipe, a belt-shaped member is supplied to the pipe-making machine, and a new band-shaped member is wound in the existing pipe. Form the tube. Here, the tube making machine adopted in the prior art has only a function of winding up a band-shaped member to a predetermined diameter which is designed in advance, and a tube newly formed by the tube making machine is an existing tube. It is considerably smaller than the inside diameter of the tube. Therefore, there is a considerable gap between the existing pipe and the new pipe, not only the position of the new pipe becomes unstable, but also the pressure of water or the like flowing through the new pipe cannot be applied to the existing pipe, The strength of the new pipe cannot be secured.

Therefore, in order to ensure the strength of the pipe arranged inside, a backfill material is injected between the inner surface of the existing pipe and the outer surface of the newly installed pipe by using a backfill material injection device. Here, in the prior art, the work of injecting the backfill material was performed after the existing pipe was provided. That is, after the new pipe is arranged in the existing pipe by the above-mentioned pipe-making machine, both ends of the existing pipe are closed to close the space formed by the inner surface of the existing pipe and the outer peripheral face of the lining pipe, and then the backing is performed. A backfill material is injected into a gap formed by the inner surface of the existing pipe and the outer peripheral surface of the lining pipe by a material injection device.

[0005] Here, the backfill material injection device of the prior art includes an outer tube for supplying one of a main liquid and a curing liquid of the backfill material, as disclosed in Japanese Patent Application Laid-Open No. 8-13985, and an outer tube for the outer tube. It consists of a tube inside which supplies the other, and a nozzle attached to the tip of the outer tube of the backfill material injection device. The main liquid and the curing liquid are mixed before the nozzle, and the backfill material is discharged from the nozzle. It was a structure to do.

[0006]

As described above, when rehabilitating an existing pipe, the lining pipe and the existing pipe are bonded and integrated with a backfill material to protect the lining pipe from external pressure, and to rehabilitate the existing pipe. In order to ensure the strength of the entire pipeline, backfill material is injected between the lining pipe and the existing pipe after lining, but high injection pressure is required for injection and to protect the lining pipe from injection pressure In addition, there is a problem that the supporting work is indispensable and the turning takes a long time.

In the backfill material injection device used in the prior art, the backfill material stays in front of the nozzle attached to the tip of the outer tube of the backfill material injection device, and the backfill material is injected. However, there was a problem that it could not be performed smoothly.

Further, according to the conventional pipe lining construction method, the pipe maker only has a function of winding up a band-shaped member to a predetermined diameter which is designed in advance. Therefore, there is a problem that a considerable reduction in the cross-sectional area of the flow path of the conduit cannot be avoided.

In order to solve the above-mentioned problems in the prior art, the present invention solves the above-mentioned problem by preventing the backfill material from staying in front of a nozzle attached to the tip of the outer tube of the backfill material injecting device. It is an object of the present invention to provide a backfill material injection device that can perform injection smoothly. In addition, the present invention can smoothly perform the work of filling the backfill material,
The purpose is to develop a lining construction method in pipes.

[0010]

According to a first aspect of the present invention, there is provided an outer tube through which one of a main liquid and a curing liquid of a backfill material flows, and an inner tube of the outer tube. An inner pipe through which the other liquid flows, and a nozzle at the tip of the outer pipe that discharges a backfill material in which the main liquid and the curing liquid are mixed,
A backfill material injection device comprising air supply means for supplying air between the outer tube and the inner tube, or at least one of the inner tube.

The backfill material injection device of the present invention has an air supply means, and the air supply means supplies air to at least one of between the outer tube and the inner tube or inside the inner tube. In the backfill material injection device of the present invention, since the backfill material is supplied with air by the above-described air supply means, the backfill material is blown off from the nozzle tip. Therefore, in the backfill material injection device of the present invention, the backfill material does not clog the tip of the nozzle. In addition, in the backfill material injection apparatus of the present invention, since the backfill material is mixed with air, the apparent viscosity of the backfill material is reduced. Therefore, the backfill material is discharged from the nozzle without staying in the vicinity of the nozzle, and the injection becomes smooth.

The invention according to claim 2 is the backfill material injection device according to claim 1, wherein the air supply means mixes air into the curing liquid of the backfill material.

In the backfill material injection device of the present invention, air is supplied to the curing liquid of the backfill material by the air supply means. Therefore, when the main liquid and the curing liquid are mixed, the backfill material is blown off from the nozzle tip by the air mixed into the curing liquid. Furthermore, since the apparent viscosity of the backfill material is reduced by the incorporation of air, the backfill material is smoothly injected.

The invention according to claim 3 is the backfill material injection device according to claim 1 or 2, wherein the air supply means mixes air into the main liquid of the backfill material.

In the backfill material injection apparatus of the present invention, air is supplied by air supply means for mixing air into the main liquid of the backfill material. As a result, air is mixed into the backfill material in which the main liquid and the curing liquid are mixed, and the air causes the backfill material to be blown off from the tip of the nozzle and at the same time reduces the apparent viscosity of the backfill material. Is smoothly discharged from the nozzle without staying in the vicinity of the nozzle, and the injection is performed smoothly.

According to a fourth aspect of the present invention, the outer tube has a long portion, an air supply tube is built in the long portion, and the air supply tube is arranged along the long portion. 2. The backfill material injection device according to claim 1, wherein the front end reaches the vicinity of the nozzle, and air is supplied into a main liquid and / or a curing liquid flowing near the nozzle by an air supply pipe.

In the backfill material injection device of the present invention, air is supplied into the main liquid or the curing liquid near the nozzle. As a result, air is supplied into the backing material almost at the same time that the main liquid and the curing liquid are mixed, and the backing material is blown off from the nozzle tip by the air. Furthermore, since the apparent viscosity of the backfill material is reduced by the incorporation of air, the backfill material can be injected smoothly.

According to a fifth aspect of the present invention, in the existing pipe, a long strip-shaped member having joints at both side edges is continuously fed by a pipe-forming machine and spirally wound.
A lining method for forming a tubular body by joining and joining mutually joined joints to each other, wherein the backfill material injection device according to any one of claims 1 to 4 is attached to a pipe making machine, and the outer surface of the tubular body and the existing tubular body are installed. This is a method for lining the inside of a pipe, which comprises injecting a backfill material between the inside of the pipe and the inside of the pipe.

In the in-pipe lining construction method of the present invention, since a tubular body (a separate pipe disposed inside the existing pipe) is formed by a pipe-forming machine inside the existing pipe and the backfill material is injected at the same time, excessive It does not require the injection pressure of the backfill material and does not require a support for protecting the lining tube from the injection pressure.

According to a sixth aspect of the present invention, a long strip-shaped member is continuously fed and spirally wound, and the joining portions that are in contact with each other are joined by fitting to form a tubular body. 6. The lining according to claim 5, wherein the tubular body is expanded so as to be close to the inner surface of the existing pipe, and a backfill material is injected between the outer surface of the tubular body being expanded and the inner surface of the existing pipe. It is a construction method.

In the in-pipe lining construction method of the present invention, since the tubular body is formed inside the existing pipe by the pipe-forming machine and at the same time the diameter is increased and the backfill material is injected, the decrease in the cross-sectional area of the flow passage in the pipe is small. In addition, excessive filling pressure is not required for filling the backfill material.

According to a seventh aspect of the present invention, in the pipe lining construction method according to the sixth aspect, the pipe-making machine is rotated forward by the feed force of the band-like member with the formation of the tubular body. A lining construction method in a pipe, wherein a diameter of the formed tubular body is increased by applying a braking force to the pipe body so as to approach the existing pipe inner surface.

In the in-pipe lining construction method of the present invention, the pipe body is formed inside the existing pipe by a pipe-forming machine, and at the same time, the diameter expansion and the filling of the backfill material are performed by using the action of the braking force. The cross-sectional area of the flow path is not greatly reduced, and no excessive pressure is required for injecting the backfill material.

According to an eighth aspect of the present invention, in the pipe lining method according to the sixth aspect, the tube-making machine is driven to rotate forward at a speed lower than a speed balanced with a speed of forming the spiral tubular body. In this method, the diameter of the spiral tubular body is increased by the feed force of the belt-shaped member during the rotation advance to bring the spiral tubular body closer to the inner surface of the existing pipe.

In the in-pipe lining construction method of the present invention, the tubular body is formed inside the existing pipe by a tube-forming machine, and at the same time, the feeding force of the band-shaped member caused by adjusting the feeding speed of the band-shaped member to the tube-making machine is reduced. Since the diameter is increased and the backfill material is used, the reduction of the cross-sectional area of the flow path of the pipeline due to the lining is small, and the injection of the backfill material does not require excessive pressure.

[0026]

Embodiments of the present invention will be further described below. FIG. 1 is a sectional view of a backfill material injection device according to an embodiment of the present invention. In the drawing, reference numeral 1 denotes a backfill material injection device according to an embodiment of the present invention. The backfill material injection device 1 of the present embodiment has an outer tube portion and an inner tube portion, and has a double tube structure as a whole. That is, the backfill material injection device 1 includes the base outer tube 5, the extension outer tube 10, and the distal end outer tube 1.
There is an outer tube configured by connecting three of them in series.
In addition, the backfill material injection device 1 has an inner tube portion configured by connecting the base inner tube 6, the extension inner tube 11, and the distal end inner tube 13. In the backfill material injection device 1 of the present embodiment, the inner tube is concentrically housed in the outer tube, and the entire structure has a double tube structure.

When the inner tube portion is built in the outer tube portion, the entire backfill material injection device 1 is largely divided into three sections as shown in FIG. That is, as shown in FIG. 1, the backfill material injection device 1 is configured by three areas of a raw material supply part 2, a double pipe extension part 3, and a tip nozzle part 4.

To explain sequentially, the raw material supply part 2 is constituted by a base end outer tube 5 and a base end inner tube 6 inside the outer tube 5. The proximal end outer tube 5 has flanges 5a and 5b provided at both ends of the tube main body, and one flange 5a is provided with a raw material liquid supply port 7. On the other hand, the proximal end inner tube 6 penetrates from the outside through the side surface of the tube main body to reach the center of the proximal end outer tube 5, and is bent in parallel with the tube main body by the elbow 6a. The distal end of the base inner tube 6 is
b protrudes to the front end side. An external thread for a tube is formed at the distal end portion of the inner tube 6 at the proximal end.

A raw material liquid supply port 8 is provided at the base of the inner tube 6 at the base end, that is, at a portion of the outer tube 5 at the base end of the base inner tube 6 which is exposed to the outside. A tee 9 a is provided in a part exposed to the outside and halfway to the raw material liquid supply port 8, and an air supply port 9 is formed. The main liquid supply hose is connected to the raw liquid supply port 7 of the base end outer tube 5. Further, a hardening liquid supply hose is connected to the raw material liquid supply port 8 of the base inner tube 6. Further, an air hose is connected to the air supply port 9 of the inner tube 6 at the base end.

The outside of the double tube extension 3 is the extension outer tube 1
0. The extension outer tube 10 is provided with a flange 10a on one end and a male screw for the tube on the other end. The double pipe extension 3 is connected to the proximal outer pipe 5 by the flange 10a described above.

Inside the extension outer tube 10, there is a part of the base inner tube 6, and an extension inner tube 11 is connected to the distal end of the base inner tube 6. Extension inner tube 11
Is formed with female threads for pipes at both ends, and is attached to the distal end of the inner tube 6 at the base end portion by the screws.

The outer side of the tip nozzle portion 4 is formed by a tip outer tube 12 and a backfill material injection nozzle 15. The distal end outer tube 12 is provided with a tube internal thread at one end and a tapered portion at the other side. A backfill material injection nozzle 15 is attached to the tip of the tapered portion.
The distal end portion outer tube 12 is attached to the distal end portion of the extension portion outer tube 10 by the above-described female screw for pipe.

On the other hand, a tip inner tube 13 is provided inside the tip nozzle portion 4. The distal end inner tube 13 has a male screw formed at one end, a blind plug 17 attached to the other end, one end sealed, and a hole 16 near the end.

In the backfill material injection apparatus of this embodiment, the main liquid supply hose is connected to the raw liquid supply port 7 of the base outer tube 5 and the raw liquid supply port 8 of the base inner pipe 6 as described above. Is connected to an air supply port 9 of the inner tube 6 at the base end. Therefore, the main liquid is introduced into the outer pipe through the raw material liquid supply port 7. The main liquid is the base outer tube 5, the extension outer tube 10, and the distal end outer tube 12
Flow sequentially.

On the other hand, the curing liquid is supplied from the raw material liquid supply port 8 to the inner tube, and flows through the base inner tube 6, the extension inner tube 11, and the front end inner tube 13 sequentially. In addition, the curing liquid flowing through the inner pipe portion was supplied from the air supply port 9 to 4.9 × 10 ⁵ Pa ( ⁵ kgf /
Air is mixed in at a pressure of cm ² ). Here, since air is directly mixed in from the air supply port 9 which is one opening of the tee 9a, the air enters the curing liquid in a relatively large foam state. That is, in the present embodiment, the air is not mixed with the curing liquid, and the air jet and the curing liquid flow in parallel. The hardening liquid and air flowing through the inner tube portion flow out of the hole 16 provided at the end of the inner tube portion from the inner tube portion 13 side to the outer tube portion 12 side, and backfill with the main liquid flowing through the outer tube portion 12. It is mixed just before the material outlet 14.

In this embodiment, since the curing liquid is mixed with air, the apparent viscosity of the mixture of the main liquid and the curing liquid is low. However, air is not necessarily mixed into the curing liquid. That is, in the present embodiment, the air is mixed in a considerably large lump state, so that the state is different from the air mortar. Then, a mixture of the curing liquid, the main liquid, and the air reaches the backing material outlet 14 at the tip nozzle portion, and is discharged from the backing material injection nozzle 15. And backfill material injection nozzle 1
When the mixed liquid is discharged from the nozzle 5, the air inside expands rapidly, and the mixed liquid accumulated at the tip of the backfill material injection nozzle 15 is blown off. At this time, the backfill material injection nozzle 15
The semi-cured mixed liquid adhering to the outside is also blown off.
Note that most of the air from the mixed liquid discharged from the backfill material injection nozzle 15 escapes to the atmosphere, and only a small amount of air finally remains in the mixed liquid. Therefore, the mixed liquid discharged from the backfill material injection device 1 of the present embodiment has a high strength, unlike air mortar (cellular cement) or the like.

In the above description, the main liquid is supplied to the outer tube of the backfill material injection tube, and the curing liquid is supplied to the inner tube. Either the main liquid or the curing liquid is supplied to the outer tube. Any structure may be used as long as it is supplied and the other is supplied to the inner tube 6. In the above description, air is supplied to the inner tube. However, air may be supplied to the outer tube. Further, a structure in which air is supplied to both the inner tube portion and the outer tube portion may be employed.

Next, another embodiment of the present invention will be described. FIG. 2 is a sectional view of a backfill material injection device 1 'according to an embodiment of the present invention described in claim 4 of the present invention. Since the backfill material injecting apparatus 1 'of this embodiment has substantially the same structure as that of the above-described embodiment, the same members as those of the previous embodiment are denoted by the same reference numerals, and duplicate description will be omitted. The backfill material injection device 1 'of this embodiment has a structure in which an air supply pipe 18 is arranged between the outer pipe part and the inner pipe part in parallel with the pipe main body instead of the air supply port in FIG. The air supply pipe 18 penetrates from the outside through the side surface of the base end outer pipe 5, reaches between the outer pipe and the inner pipe of the backfill material injection pipe, and is bent parallel to the pipe main body. One end of the air supply pipe 18 reaches the vicinity of the hole 16 and the other end exposed to the outside is connected to an air hose.

In the backfill material injection apparatus 1 'of this embodiment, the main liquid is supplied to the outer tube from the raw material supply port 7 and the hardening liquid is supplied to the inner pipe from the raw material supply port 8 as in the previous embodiment. Supplied. The air was 4.9 × 10 ⁵ Pa ( ⁵ kgf / c).
The air is supplied to the air supply pipe 18 at a pressure of m ² ) and is introduced into the outer pipe near one hole 16 from one end of the air supply pipe 18 in the backfill material injection device 1 ′. The curing liquid supplied to the inner tube portion flows out of the hole 16 provided at the end of the inner tube portion from the side of the inner tube 13 toward the outer tube 12. And hole 16
In the vicinity, the main liquid, the curing liquid and the air are mixed.

In this embodiment, since the main liquid, the curing liquid and the air are mixed, the apparent viscosity of the mixture of the main liquid and the curing liquid is low. Then, a mixture of the curing liquid, the main liquid, and the air reaches the backing material outlet 14 at the tip nozzle portion, and is discharged from the backing material injection nozzle 15. Further, when the mixed liquid is discharged from the backfill material injection nozzle 15, the internal air rapidly expands, and the mixed liquid accumulated at the tip of the backfill material injection nozzle 15 is blown off. Further, at this time, the semi-cured mixed liquid attached to the outside of the backfill material injection nozzle 15 is also blown off.

In the above description, the main liquid is supplied to the outer tube of the backfill material injection tube, and the curing liquid is supplied to the inner tube disposed inside the outer tube. Any structure may be used as long as one of them is supplied to the outer tube and the other is supplied to the inner tube. Further, in the above, the air supply pipe is arranged between the outer pipe and the inner pipe so as to extend along the long section of the outer pipe, but the air supply pipe is provided inside the inner pipe so as to extend along the long section of the outer pipe. A structure in which a tube is arranged may be used. Further, the air supply pipe may be arranged along the long part of the outer pipe both between the outer pipe and the inner pipe and inside the inner pipe.

Next, the actual method of using the backfill material injection devices 1 and 1 'will be described step by step in the lining of the pipe. 3A and 3B show a tube making machine used in the lining of the pipe of the present embodiment, wherein FIG. 3A is a side view and FIG. 3B is a front view. Reference numeral 1 denotes the backfill material injecting device 1 or 1 'attached to the frame of the tube making machine, which is attached in parallel to the direction in which the outer peripheral surface of the tube making machine is lined. In FIG. 3, reference numeral 21 denotes a circular ring-shaped frame, 22 denotes a joining mechanism, which has an outer roller 41 and an inner roller 42, and these rollers are connected to a hydraulic motor 45 via a gear box 43.
It is the structure connected to. Reference numeral 23 denotes a guide roller for guiding the spirally joined tubular body of the belt-shaped member under regulation of the inner diameter. 24
Reference numeral denotes a brake wheel for supporting the pipe-making machine in the existing pipe A for braking, and is a mechanism for disposing a disk brake therein and expressing a braking force. Reference numeral 51 denotes an arm that supports the braking wheel. The arm 51 presses the braking wheel by the coil spring 52 into the existing pipe.

A method of lining an existing pipe by using the above-mentioned pipe making machine will be sequentially described. First, the tube making machine shown in FIG.
Install in the existing pipe as shown in (a). Subsequently, a belt-shaped member is spirally supplied from outside the existing pipe to the joining mechanism section 22 of the pipe making machine installed in the existing pipe. The belt-shaped member used here has a male locking ridge j ″ at one end as shown in FIG.
A female locking groove j 'is formed at the other end, and has a shape that can be fitted to each other. More specifically, the belt-shaped member has a longitudinal T-shaped rib j formed on the outer surface thereof at a constant width direction interval, and a female locking groove is formed at the base of the T-shaped rib j on one edge side of the belt-shaped member. j ′, and a male locking ridge j ″ is formed on the other edge side of the band-shaped member. The band-shaped member supplied to the joining mechanism 22 is a male locking ridge. The j ″ and the female locking groove j ′ are fed into the existing pipe while being fitted by the outer roller 41 and the inner roller 42, thereby being formed into a new tubular body (a separate pipe) in the existing pipe. The pipe-making machine is rotated forward by a force applied when the belt-shaped member is supplied in a spiral shape, and a braking force m is applied by the brake shoe 51 to the forward rotation so that the tubular body approaches the existing pipe inner surface. Expand the diameter. At this time, the backfill material injection nozzle of the backfill material injection device 1 or 1 'attached to the tube making machine is arranged between the tubular body during the expansion and the existing pipe, whereby the backfill material is interposed between the two. Fill and fill.

The backfill material used in the present invention is not particularly limited, but from the viewpoint of strength and workability, 20 to 100 parts by weight of filler, 5 to 2 parts of emulsion and 100 parts by weight of cement.
0 parts by weight, 0.01 to 1.0 parts by weight of a foaming agent, 20 to 3 parts of water
A main solution consisting of 00 parts by weight and a hardening solution consisting of a cement setting agent (setting agent) in a volume ratio of main solution: hardening solution = 10: 0.5-
Two-pack mortars mixed at a ratio of 2.0 are preferred.

The cement used in the present invention includes ordinary Portland cement, early-strength Portland cement, moderately heated Portland cement, blast furnace cement, fly ash cement and the like. Moderate heat Portland cement, blast furnace cement, and fly ash cement, which preferably generate a small amount of heat, are preferred.

The filler can be used as long as it is generally added to the mortar, for example, aggregates such as silica sand and river sand, cement admixtures such as fly ash and blast furnace slag,
Examples include clay minerals such as bentonite, sepiolite, talc, and kaolin; and lightweight aggregates such as fly ash balloons, perlites, shirasu balloons, and foamed resin balloons.

Examples of the emulsion include a vinyl acetate emulsion adhesive, an ethylene / vinyl acetate copolymer (EVA) emulsion adhesive, a synthetic rubber latex adhesive, and an acrylic emulsion adhesive. If there is, it is not limited.

The foaming agent can be used as long as it reacts with the alkali component of the cement to generate gas.
For example, Mg, Ca, Cr, Mn, Fe, Co, Ni,
Metal powders such as Cu, Zn, Al, Ga, Sn, Se, Si, ferrosilicon, aqueous hydrogen peroxide, potassium peroxide,
And peroxides such as sodium perborate. Among them, Al, because of cost, safety and workability (delay of foaming)
And metal powders of Si and ferrosilicon. When metal powder is used as a foaming agent, the average particle size of the powder becomes smaller and the dispersibility decreases, causing rapid foaming,
If it is too large, the reactivity decreases, so that the thickness is preferably 1 to 200 μm. If the addition amount is too large, the expansion ratio increases and the strength is reduced. If the addition amount is too small, the foaming ratio does not reach the predetermined expansion ratio and causes voids.
It is preferably from 0.5 to 1.0 part by weight. The method of delaying the start of foaming is not particularly limited as long as the surface of the metal powder is made to have low alkali reactivity. For example, there is a method of oxidizing a metal surface to form an oxide film of the metal. This oxide film can be easily manufactured by exposing or holding the metal powder at an oxidation temperature or higher by, for example, rotting the metal surface. Mix the metal powder in a dispersed state in a neutral aqueous solution such as water or an organic solvent, and wet the surface of the metal powder with the solvent, or coat the metal surface with a component that is lowly reactive to alkali. Is also good. When aqueous hydrogen peroxide is used as the foaming agent, if the concentration of the aqueous solution is reduced, the viscosity of the composition decreases and the bubbles become unstable.If the concentration is too high, the foaming starts quickly and the workability is inferior. % Is preferred.

As the cement quick setting agent (quick setting agent), any general cement setting agent can be used without limitation. For example, sodium aluminate, sodium carbonate, and sodium silicate (molar ratio: 2 to 3) are used in the inorganic salt system, calcium aluminates and calcium sulfoaluminate are used in the cement mineral system, and glycerin and triethanolamine are used in the organic system. . Sodium silicate is preferred from the viewpoint of mixing with the main liquid and economy. In addition, a water reducing agent generally used in concrete or mortar, a fluidity modifier such as an AE water reducing agent, a reinforcing fiber such as an organic fiber, and the like can be added according to the purpose.

Returning to the description of the present embodiment, in the present embodiment, as described above, the pipe making machine is installed in the existing pipe as shown in FIG. Subsequently, a belt-like shape having a male locking ridge j "formed at one end and a female locking groove j 'formed at the other end from the outside of the existing pipe to the joining mechanism portion 22 of the pipe making machine installed in the existing pipe. The belt-shaped member supplied to the joining mechanism 22 is provided with a male locking ridge j ″ and a female locking groove j ′ fitted with the outer roller 41 and the inner roller 42. It is fed into the pipe and a new tubular body is formed in the existing pipe. At this time, as shown in FIG. 4, the tubular body e is fed by a pipe-making machine at a feed speed V of the belt-like member at a radius r. At this time, the rotation speed V /
When rotating at a speed lower than 2πr (rotation speed n), a difference occurs in the exchange of the band-shaped member between the formation speed of the lining tube E and the rotation speed of the tube-making machine at a low rotation speed n. It is absorbed by the diameter expansion sliding w of e.

In FIG. 4, if m is the braking force acting on the pipe making machine, r is the pipe making radius, F is the feeding force of the strip, V is the feeding speed of the strip, and R is the inner diameter of the existing pipe, m In the case of <Fr, only the shearing force of Fr acts on the tubular body. m>
At Fr, due to the braking force m, a shearing force S regulated by the braking force acts on the tubular body, and SR =
m is applied. The force per unit length of the perimeter required to slide and expand the belt-like member described above (hereinafter, the force per unit length)
Assuming that the band member fitting force is f, S> 2πRf,
Ie

M> 2πR ² f (Equation 1)

When the condition is satisfied, lining on the inner surface of the existing pipe becomes possible. In this case, since the rotation speed at which the band-shaped member is attached to the existing pipe inner surface at the enlarged diameter end portion is substantially equal to the rotation speed of the tube making machine, the rotation speed n of the tube making machine is

N = V / 2πR (Equation 2)

Is as follows. The shearing force s at the radius of the tapered portion is

S = m / X (Equation 3)

Is given by

When the braking force m is increased, the shearing force m / 2πX is increased, and the degree of diameter expansion per unit length of the pipe is increased. This facilitates cleavage of the fitting joint. Therefore, the braking force m
Is set to be as small as possible to prevent cleavage damage of the fitting joint and to stably maintain the crossing point, on condition that sliding expansion of the fitting joint can be caused. Is preferred. The gradient of the enlarged diameter portion depends on the braking force m. In addition, as is apparent from the equation (2), the rotation speed n of the pipe making machine is changed by the feed speed V of the belt-shaped member, and the diameter expansion state is changed by this change. Therefore, the diameter expansion state can be controlled by adjusting the braking force m and the feed speed V of the belt-shaped member using the change in the diameter expansion state and the change in the rotation speed N of the pipe making machine as a detection signal. For example, the feed speed V of the belt-shaped member can be adjusted with the braking force m kept constant, or the braking force m can be adjusted with the feed speed V of the belt-shaped member kept constant. The change in the expanded state is performed by rotating a reference ruler (a rod bent in accordance with the taper angle of the expansion gradient, which is linked to the braking section side frame of the pipe making machine, and detecting each rotation by a detection signal. And a contact sensor disposed at a predetermined position in the reference gradient.

In the present embodiment, for the final finishing, the diameter of the lining pipe can be increased by using a separate diameter expanding jig to increase the degree of close contact with the inner surface of the existing pipe. If the existing pipe is non-circular, it can be expanded in a circular shape and then formed into a non-circular shape with a forming jig. In addition, the shearing force m / X when the fitting joint of the tubular member is slid to expand the diameter increases as the pipe diameter X decreases, that is, the initial expansion area closer to the pipe-making machine increases, resulting in an excessive expansion. Therefore, a taper guide roller for preventing excessive diameter expansion can be provided in the initial diameter expansion region. Alternatively, the guide rollers of the tube making machine can be arranged in a tapered manner. If the band-like member fitting force f per unit length of the fitting joint in the formula (1) can be reduced and the sliding diameter of the fitting joint can be increased with a small shearing force, the above-mentioned excessive expansion is achieved. It is effective to eliminate the diameter and apply a lubricant to the fitting portion.

In the lining construction method of this embodiment, the backfill material injecting device 1 or 1 'is attached to the tube making machine as described above, and the backfill material is injected by rotating integrally with the tube making machine. . Therefore, in FIG. 4, the relative rotation speed between the nozzle of the backfill material injection device 1 or 1 ′ and the outer surface of the tubular body during the expansion is the expansion end b (the intersection between the expansion tube and the inner surface of the existing pipe). Is 0. Further, since the rotation speed of the tube making machine is V / 2πR as shown in the equation (2) and the rotation speed of the belt-shaped member is V / 2πr, the relative rotation speed at the expanding start end e is (V / 2πR). )-(V / 2πr). Since the sliding rotational speed of the belt-shaped member at the radius X of the tapered enlarged portion is V / 2πX, the relative rotational speed Δ between the nozzle of the backfill material injection pipe and the outer surface of the tubular body being enlarged at that point.
N is

ΔN = V / 2π (1 / R−1 / X) (Equation 4)

When the nozzle of the backfill material injecting device 1 or 1 'is located at that location, the backfill material discharged from the backfill material outlet is transferred by the spiral movement toward the crossing point of the band-shaped member. And pressurized at the intersection.

If the nozzle is located at the beginning of the diameter expansion,
The backfill material is discharged at a relatively high relative rotation speed ΔN. However, since the discharge to the outer surface of the tubular body where the diameter expansion sliding has hardly begun, the relative speed between the nozzle and the outer surface of the tubular body is substantially constant without being affected by the fitting force of the fitting portion, and the distance between the ribs and the like is maintained. Can be smoothly filled into the concave portion, and by this filling, the backfill material can be stably held even when passing through the lower position of the tubular body due to the diameter-sliding sliding. Further, when the backfill material injection device according to the first to fourth aspects is used, the apparent viscosity of the backfill material is reduced, so that the backfill material can be smoothly filled into the rib concave portions. However, it is possible to discharge in a laid state, and finally, the space between the ribs can be filled without a gap by pressing the backfill material at the intersection.
Furthermore, in order to complete the filling by pressurization at the intersection, the surface of the rib j may be curved to promote the backfill material to flow between the ribs.

Further, at the enlarged diameter end b (the intersection of the enlarged diameter pipe and the inside of the existing pipe), the rotational speed at which the band-shaped member is attached and the rotational speed with the tube making machine are the same. When arranging, the iron for guiding the discharged backfill material to its enlarged end b is attached to a tube making machine, a uniform backfill material is formed with the iron, and the iron is rotated with respect to the existing pipe. The backfill material is rubbed into the corner of the intersection at a speed of approximately V / 2πR. Also, an annular weir plate covering the entire circumference of the space between the tapered enlarged tubular body and the existing pipe inner surface is attached to the pipe making machine with a support rod, and the nozzle of the backfill material injection pipe is introduced deeper than the weir, The backfill material may be injected into a space defined from the weir to the intersection. In addition, a vacuum pipe can be attached to the pipe making machine, and the backfill material accumulated and accumulated excessively can be removed by suction to control the supply amount of the backfill material. Also,
The backfilling material discharged from the backfilling material injection pipe nozzle has a different spreading range depending on the height of the nozzle. The spreading range is higher at the upper position and narrower at the lower position. The discharge amount of the backfill material can be adjusted in accordance with the rotation position of the rotary joint of the injection pipe to achieve substantially uniform distribution. Further, a notch groove is provided in the rib of the band-shaped member, and the flow of discharging the excess backfill material can be smoothly performed by using the notch groove as a short-circuit path, so that the workability of the uniform spraying can be improved. In this case, in order to prevent the guide roll for regulating the outer surface of the pipe making machine or the outer roll (drive roll) of the joining mechanism from coming into non-contact with the notch groove and rotating idly, the notch groove is formed in the width direction of the band-shaped member. Preferably, it is provided at an angle, ie, non-parallel to the outer roll.

In the above-mentioned lining lathe method, the spiral tubular body produced by the tube producing machine is expanded by braking the rotational advance of the tube producing machine with a predetermined braking force until it comes into contact with the inner surface of the existing pipe. The pipe making machine may be driven so as to rotate and advance the machine at a predetermined speed, and the diameter may be increased until the machine comes into contact with the inner surface of the existing pipe. That is, using a device having a mechanism similar to that of the above-mentioned tube-making machine, and further having a drive wheel for driving the tube-making machine to rotate forward, the tube-making machine is housed in the existing pipe, and hydraulic pressure is provided by a hydraulic pump on the manhole on the arrival side. The outer roller and the inner roller of the joining mechanism of the pipe making machine are driven via the hose. Then, the belt-shaped member supplied from the drum on the starting side manhole is spirally fed by the outer roller and the inner roller of the joining mechanism, and the belt-shaped member spiral already formed by the outer roller and the inner roller of the first joining mechanism. A male locking convex kume at one edge of the band-shaped member fed into the first joining mechanism is fitted into and joined to the female locking groove at the edge of the joined tubular body to form a spiral tubular body. At the same time, the tube making machine is driven to rotate forward at a speed lower than the speed balanced with the forming speed of the spiral tubular body by driving the drive wheels, and during this rotational advance, the spiral tubular body is fed by the feed force of the belt member of the outer roller and the inner roller. And make it closer to the inner surface of the existing pipe. Then, the backfill material injection nozzle of the backfill material injection device 1 or 1 'is arranged between the tubular body whose diameter is being expanded and the existing pipe, whereby the backfill material is injected and filled between the two.

The rotational speed N of the tube making machine, which is balanced with the tube making speed of the spiral tubular body, is V / 2πr, where V is the feed speed of the belt-like member and r is the tube making radius. Even when rotated at this speed, the helical tubular body is not expanded. When the tube making machine is driven to rotate at a rotation speed lower than the rotation speed V / 2πr, the moving speed of the tube making machine becomes slower than the forming speed of the spiral tube, so that the spiral tubular body fed from the tube making machine has a belt-shaped member. , And a shearing force is applied to the fitting joint of the spiral tubular body by a torsional moment (a torsional moment in the direction in which the spiral is unwound) due to the feed force.
When this shearing force overcomes the fitting force of the fitting joint, the diameter of the pipe is slid and expanded, and comes into contact with the inner surface of the existing pipe. Therefore, the condition for expanding the diameter to the inner surface of the existing pipe is that the braking force m of the formula (1) in the above-described braking expansion lining method is applied to the tubular body before the expansion by the feeding force F of the belt-shaped member. By replacing it with the torsional moment Fr

Fr / 2πR2> f (Equation 5)

Is given by Further, the driving rotation speed n of the pipe-making machine is given by the above-mentioned equation (2), and is equal to the rotation speed N at the time of forming a pipe of radius r.

N = rN / R (Equation 6)

Is obtained. In the above, if the feeding force F of the band-shaped member is too large, the shearing force becomes large and the degree of diameter expansion per unit length of the pipe becomes large. Is easily sheared.
Therefore, the feeding force F of the band-shaped member is intended to prevent the open shear damage of the fitting joint and to stably maintain the crossing point, provided that the sliding expansion of the fitting joint can be caused. It is preferable to set as small as possible. Since the expanded state is changed by the feed force F, the feed speed V, and the rotation speed n of the tube forming machine, the expanded state is detected, and the feed force F,
The diameter expansion state can be controlled by adjusting the feed speed V and the rotational speed n of the tube making machine.

As described above, even when the pipe-making machine is driven at a predetermined speed to perform the diameter-enlargement lining, the outer surface of the tubular body being expanded is placed on the outer surface of the backing material injection pipe, which is integrally rotated with the tube-making machine. The filling material is discharged and backfilling can be performed simultaneously with lining. Also in this backfilling work, detecting the expanded state and controlling the driving speed of the pipe making machine or the feed speed or feeding force of the belt-shaped member to stabilize the expanded state, according to the rotational position of the pipe making machine The discharge flow rate of the backfill material is adjusted so that the backfill material is evenly dispersed, and a notch groove for circulation with respect to the backfill material can be formed in the rib on the outer surface of the belt-shaped member.

[0072]

According to the backfill material injecting device of the first to fourth aspects, the apparent viscosity is reduced by mixing air into the backfill material. Also, the backfill material does not stay in the backfill material injection device due to the pressure of the supplied air, and is discharged vigorously from the backfill material injection nozzle.

According to the pipe lining construction method according to the fifth to eighth aspects, the backfill material is simultaneously supplied to the lining pipe and the existing pipe by the backfill material injection device attached to the pipe making machine. Can be filled between surfaces. Therefore, the backfilling work that was conventionally performed after the installation of the new tubular body in the existing pipe can be performed at the same time as the installation of the new tubular body, thereby simplifying the construction and shortening the construction period required for lining the existing pipe. is there.

[Brief description of the drawings]

FIG. 1 is a drawing showing an example of a backfill material injection device used in the present invention.

FIG. 2 is a drawing showing an example of a backfill material injection device used in the present invention.

FIG. 3 is a drawing showing an example of a tube making machine used in the present invention.

FIG. 4 is a drawing showing a lining construction method according to the present invention.

FIG. 5 is a cross-sectional view showing a belt-shaped member used in the lining construction method.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 backfill material injection device 2 backfill material raw material supply part 3 double pipe rod part 4 tip nozzle part 5 outer pipe 6 inner pipe 7 main liquid supply port 8 hardening liquid supply port 9 air supply port 10 outer pipe 11 inner pipe 12 Outer pipe 13 Inner pipe 14 Backfill material outlet 15 Backfill material injection nozzle 16 Hole 17 Air supply pipe

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yuzo Yokoyama 2-2 Kami-Tokagamichocho-cho, Minami-ku, Kyoto Sekisui Kagaku Kogyo Co., Ltd. (72) Inventor Hiroshi Sugawara 2 Kamikaba-Kamikocho, Minami-ku, Kyoto -2 Sekisui Kagaku Kogyo Co., Ltd. F-term (reference) 2D055 JA02 LA14

Claims (8)

[Claims] 1. A backfill material injection device used for disposing a separate pipe inside an existing pipe and filling a backfill material in which a main liquid and a curing liquid are mixed therebetween. An outer tube through which either the main liquid or the curing liquid flows, an inner tube inside the outer tube through which the other liquid flows, and a back surface at the tip of the outer tube where the main liquid and the curing liquid are mixed. A backfill material injection device, comprising: a nozzle that discharges a fill material; and an air supply unit that supplies air to at least one of between an outer tube and an inner tube or inside the inner tube. 2. The backfill material injection device according to claim 1, wherein air is mixed into the hardening liquid of the backfill material by the air supply means. 3. The backfill material injection device according to claim 1, wherein air is mixed into the main liquid of the backfill material by the air supply means. 4. The outer tube has a long part, and an air supply pipe is built in the long part, and the air supply pipe is arranged along the long part, and a tip end thereof is close to a nozzle. The backfill material injection device according to claim 1, wherein air is supplied to the main liquid and / or the curing liquid flowing near the nozzle by an air supply pipe. 5. A long strip-shaped member having joints at both side edges is continuously fed by a pipe-making machine and wound helically in an existing pipe, and the joints that are in contact with each other are joined by fitting. In a lining method for forming a tubular body by forming a tubular body, the backfill material injecting device according to any one of claims 1 to 4 is attached to a tube making machine, and the backfill material is injected between the outer surface of the tubular body and the inner surface of the existing pipe. A lining construction method in a pipe characterized by performing. 6. A long strip-shaped member is continuously fed and spirally wound, and the joining portions that are in contact with each other are joined by fitting to form a tubular body. The method of lining a pipe according to claim 5, wherein a backfill material is injected between the outer surface of the expanding tubular body and the inner surface of the existing pipe close to the inner surface of the pipe. 7. A method according to claim 6, wherein the pipe-making machine is rotated forward by the feed force of the belt-like member in accordance with the formation of the tubular body, and a braking force is applied to the rotational advance. A method of lining a pipe, wherein the diameter of the formed tubular body is increased and brought closer to the inner surface of the existing pipe. 8. The method according to claim 6, wherein the pipe-making machine is driven to rotate forward at a speed lower than a speed that is balanced with the speed of forming the spiral tubular body, and the belt-shaped member is rotated during the forward rotation. A method for constructing a pipe with a large diameter lining, characterized in that the diameter of the spiral tubular body is increased with a feeding force so as to approach the existing pipe inner surface.